SOLUTION: An oil company is interested in estimating the true proportion of female truck drivers based in five southern states. A statistician hired by the oil company must determine the sam

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Question 671598: An oil company is interested in estimating the true proportion of female truck drivers based in five southern states. A statistician hired by the oil company must determine the sample size needed in order to make the estimate accurate to within 2% of the true proportion with 95% confidence. What is the minimum number of truck drivers that the statistician should sample in these southern states in order to achieve the desired accuracy? Use the appropriate table in your book.
Answer by stanbon(75887) (Show Source):
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An oil company is interested in estimating the true proportion of female truck drivers based in five southern states. A statistician hired by the oil company must determine the sample size needed in order to make the estimate accurate to within 2% of the true proportion with 95% confidence. What is the minimum number of truck drivers that the statistician should sample in these southern states in order to achieve the desired accuracy?
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n = [z/E]^2*pq
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Since no p estimate is available the "least biased" estimate is p = 1/2
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n = [1.96/0.02]^2(1/2)(1/2)
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n = 2401
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Cheers,
Stan H.
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